.link{
    text-decoration: none;
    display: inline-block;
    width: 150px;
    height: 40px;
    text-align: center;
    font-size: 20px;
}

.active{
    background-color: indianred;
    color: #fff;
}
.content{
    width: 1200px;
    margin: 0 auto;
    min-height: 600px;
}